All Time Bowl Records by conference:
Big Ten vs:
Opponent
Record
ACC
(11-16-0)--0.40741
Big 12
(15-18-0)--0.45455
Big Eight
(4-1-0)--0.80000
PAC-12
(40-47-0)--0.45977
SEC
(28-49-0)--0.36364
Conf Record
SEC (235-174-9)--0.57297
PAC-12 (137-118-5)--0.53654
Big Eight (63-64-1)--0.49609
Big 12 (70-75-0)--0.48276
ACC (108-119-2)--0.47598
Big Ten (123-146-1)--0.45741
Bowl games should match relatively even teams against each other - top of the conference versus top of conference, middle of the road vs middle of the road. In such a setting one would presume that the results would be close to even.
Perhaps the Big Ten suffers because it wasn't until the late 70s that more than 1 team was allowed to go bowling. The same was true for the Pac 12.
There is also the case that ACC, SEC, and Big 8/12/12-2, would not play against teams with Black athletes until integration hit in late 60s.
It seems to me that we can make one of two conclusions: 1. The Big 10 doesn't match up very well against other conferences. Or, 2. Always playing out of region has a negative affect on Big Ten performance.